Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

14 files changed, 2539 insertions, 0 deletions

diff --git a/arch/frv/mm/Makefile b/arch/frv/mm/Makefile
new file mode 100644
index 00000000000..fb8b1d860f4
--- /dev/null
+++ b/arch/frv/mm/Makefile
@@ -0,0 +1,9 @@
+#
+# Makefile for the arch-specific parts of the memory manager.
+#
+
+obj-y := init.o kmap.o
+
+obj-$(CONFIG_MMU) += \
+	pgalloc.o highmem.o fault.o extable.o cache-page.o tlb-flush.o tlb-miss.o \
+	mmu-context.o dma-alloc.o unaligned.o elf-fdpic.o
diff --git a/arch/frv/mm/cache-page.c b/arch/frv/mm/cache-page.c
new file mode 100644
index 00000000000..683b5e34431
--- /dev/null
+++ b/arch/frv/mm/cache-page.c
@@ -0,0 +1,66 @@
+/* cache-page.c: whole-page cache wrangling functions for MMU linux
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <asm/pgalloc.h>
+
+/*****************************************************************************/
+/*
+ * DCF takes a virtual address and the page may not currently have one
+ * - temporarily hijack a kmap_atomic() slot and attach the page to it
+ */
+void flush_dcache_page(struct page *page)
+{
+	unsigned long dampr2;
+	void *vaddr;
+
+	dampr2 = __get_DAMPR(2);
+
+	vaddr = kmap_atomic(page, __KM_CACHE);
+
+	frv_dcache_writeback((unsigned long) vaddr, (unsigned long) vaddr + PAGE_SIZE);
+
+	kunmap_atomic(vaddr, __KM_CACHE);
+
+	if (dampr2) {
+		__set_DAMPR(2, dampr2);
+		__set_IAMPR(2, dampr2);
+	}
+
+} /* end flush_dcache_page() */
+
+/*****************************************************************************/
+/*
+ * ICI takes a virtual address and the page may not currently have one
+ * - so we temporarily attach the page to a bit of virtual space so that is can be flushed
+ */
+void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
+			     unsigned long start, unsigned long len)
+{
+	unsigned long dampr2;
+	void *vaddr;
+
+	dampr2 = __get_DAMPR(2);
+
+	vaddr = kmap_atomic(page, __KM_CACHE);
+
+	start = (start & ~PAGE_MASK) | (unsigned long) vaddr;
+	frv_cache_wback_inv(start, start + len);
+
+	kunmap_atomic(vaddr, __KM_CACHE);
+
+	if (dampr2) {
+		__set_DAMPR(2, dampr2);
+		__set_IAMPR(2, dampr2);
+	}
+
+} /* end flush_icache_user_range() */
diff --git a/arch/frv/mm/dma-alloc.c b/arch/frv/mm/dma-alloc.c
new file mode 100644
index 00000000000..4b38d45435f
--- /dev/null
+++ b/arch/frv/mm/dma-alloc.c
@@ -0,0 +1,188 @@
+/* dma-alloc.c: consistent DMA memory allocation
+ *
+ * Derived from arch/ppc/mm/cachemap.c
+ *
+ *  PowerPC version derived from arch/arm/mm/consistent.c
+ *    Copyright (C) 2001 Dan Malek (dmalek@jlc.net)
+ *
+ *  linux/arch/arm/mm/consistent.c
+ *
+ *  Copyright (C) 2000 Russell King
+ *
+ * Consistent memory allocators.  Used for DMA devices that want to
+ * share uncached memory with the processor core.  The function return
+ * is the virtual address and 'dma_handle' is the physical address.
+ * Mostly stolen from the ARM port, with some changes for PowerPC.
+ *						-- Dan
+ * Modified for 36-bit support.  -Matt
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/stddef.h>
+#include <linux/vmalloc.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+
+#include <asm/pgalloc.h>
+#include <asm/io.h>
+#include <asm/hardirq.h>
+#include <asm/mmu_context.h>
+#include <asm/pgtable.h>
+#include <asm/mmu.h>
+#include <asm/uaccess.h>
+#include <asm/smp.h>
+
+static int map_page(unsigned long va, unsigned long pa, pgprot_t prot)
+{
+	pgd_t *pge;
+	pud_t *pue;
+	pmd_t *pme;
+	pte_t *pte;
+	int err = -ENOMEM;
+
+	spin_lock(&init_mm.page_table_lock);
+
+	/* Use upper 10 bits of VA to index the first level map */
+	pge = pgd_offset_k(va);
+	pue = pud_offset(pge, va);
+	pme = pmd_offset(pue, va);
+
+	/* Use middle 10 bits of VA to index the second-level map */
+	pte = pte_alloc_kernel(&init_mm, pme, va);
+	if (pte != 0) {
+		err = 0;
+		set_pte(pte, mk_pte_phys(pa & PAGE_MASK, prot));
+	}
+
+	spin_unlock(&init_mm.page_table_lock);
+	return err;
+}
+
+/*
+ * This function will allocate the requested contiguous pages and
+ * map them into the kernel's vmalloc() space.  This is done so we
+ * get unique mapping for these pages, outside of the kernel's 1:1
+ * virtual:physical mapping.  This is necessary so we can cover large
+ * portions of the kernel with single large page TLB entries, and
+ * still get unique uncached pages for consistent DMA.
+ */
+void *consistent_alloc(int gfp, size_t size, dma_addr_t *dma_handle)
+{
+	struct vm_struct *area;
+	unsigned long page, va, pa;
+	void *ret;
+	int order, err, i;
+
+	if (in_interrupt())
+		BUG();
+
+	/* only allocate page size areas */
+	size = PAGE_ALIGN(size);
+	order = get_order(size);
+
+	page = __get_free_pages(gfp, order);
+	if (!page) {
+		BUG();
+		return NULL;
+	}
+
+	/* allocate some common virtual space to map the new pages */
+	area = get_vm_area(size, VM_ALLOC);
+	if (area == 0) {
+		free_pages(page, order);
+		return NULL;
+	}
+	va = VMALLOC_VMADDR(area->addr);
+	ret = (void *) va;
+
+	/* this gives us the real physical address of the first page */
+	*dma_handle = pa = virt_to_bus((void *) page);
+
+	/* set refcount=1 on all pages in an order>0 allocation so that vfree() will actually free
+	 * all pages that were allocated.
+	 */
+	if (order > 0) {
+		struct page *rpage = virt_to_page(page);
+
+		for (i = 1; i < (1 << order); i++)
+			set_page_count(rpage + i, 1);
+	}
+
+	err = 0;
+	for (i = 0; i < size && err == 0; i += PAGE_SIZE)
+		err = map_page(va + i, pa + i, PAGE_KERNEL_NOCACHE);
+
+	if (err) {
+		vfree((void *) va);
+		return NULL;
+	}
+
+	/* we need to ensure that there are no cachelines in use, or worse dirty in this area
+	 * - can't do until after virtual address mappings are created
+	 */
+	frv_cache_invalidate(va, va + size);
+
+	return ret;
+}
+
+/*
+ * free page(s) as defined by the above mapping.
+ */
+void consistent_free(void *vaddr)
+{
+	if (in_interrupt())
+		BUG();
+	vfree(vaddr);
+}
+
+/*
+ * make an area consistent.
+ */
+void consistent_sync(void *vaddr, size_t size, int direction)
+{
+	unsigned long start = (unsigned long) vaddr;
+	unsigned long end   = start + size;
+
+	switch (direction) {
+	case PCI_DMA_NONE:
+		BUG();
+	case PCI_DMA_FROMDEVICE:	/* invalidate only */
+		frv_cache_invalidate(start, end);
+		break;
+	case PCI_DMA_TODEVICE:		/* writeback only */
+		frv_dcache_writeback(start, end);
+		break;
+	case PCI_DMA_BIDIRECTIONAL:	/* writeback and invalidate */
+		frv_dcache_writeback(start, end);
+		break;
+	}
+}
+
+/*
+ * consistent_sync_page make a page are consistent. identical
+ * to consistent_sync, but takes a struct page instead of a virtual address
+ */
+
+void consistent_sync_page(struct page *page, unsigned long offset,
+			  size_t size, int direction)
+{
+	void *start;
+
+	start = page_address(page) + offset;
+	consistent_sync(start, size, direction);
+}
diff --git a/arch/frv/mm/elf-fdpic.c b/arch/frv/mm/elf-fdpic.c
new file mode 100644
index 00000000000..f5a653033fe
--- /dev/null
+++ b/arch/frv/mm/elf-fdpic.c
@@ -0,0 +1,123 @@
+/* elf-fdpic.c: ELF FDPIC memory layout management
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/elf-fdpic.h>
+
+/*****************************************************************************/
+/*
+ * lay out the userspace VM according to our grand design
+ */
+#ifdef CONFIG_MMU
+void elf_fdpic_arch_lay_out_mm(struct elf_fdpic_params *exec_params,
+			       struct elf_fdpic_params *interp_params,
+			       unsigned long *start_stack,
+			       unsigned long *start_brk)
+{
+	*start_stack = 0x02200000UL;
+
+	/* if the only executable is a shared object, assume that it is an interpreter rather than
+	 * a true executable, and map it such that "ld.so --list" comes out right
+	 */
+	if (!(interp_params->flags & ELF_FDPIC_FLAG_PRESENT) &&
+	    exec_params->hdr.e_type != ET_EXEC
+	    ) {
+		exec_params->load_addr = PAGE_SIZE;
+
+		*start_brk = 0x80000000UL;
+	}
+	else {
+		exec_params->load_addr = 0x02200000UL;
+
+		if ((exec_params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) ==
+		    ELF_FDPIC_FLAG_INDEPENDENT
+		    ) {
+			exec_params->flags &= ~ELF_FDPIC_FLAG_ARRANGEMENT;
+			exec_params->flags |= ELF_FDPIC_FLAG_CONSTDISP;
+		}
+	}
+
+} /* end elf_fdpic_arch_lay_out_mm() */
+#endif
+
+/*****************************************************************************/
+/*
+ * place non-fixed mmaps firstly in the bottom part of memory, working up, and then in the top part
+ * of memory, working down
+ */
+unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len,
+				     unsigned long pgoff, unsigned long flags)
+{
+	struct vm_area_struct *vma;
+	unsigned long limit;
+
+	if (len > TASK_SIZE)
+		return -ENOMEM;
+
+	/* only honour a hint if we're not going to clobber something doing so */
+	if (addr) {
+		addr = PAGE_ALIGN(addr);
+		vma = find_vma(current->mm, addr);
+		if (TASK_SIZE - len >= addr &&
+		    (!vma || addr + len <= vma->vm_start))
+			goto success;
+	}
+
+	/* search between the bottom of user VM and the stack grow area */
+	addr = PAGE_SIZE;
+	limit = (current->mm->start_stack - 0x00200000);
+	if (addr + len <= limit) {
+		limit -= len;
+
+		if (addr <= limit) {
+			vma = find_vma(current->mm, PAGE_SIZE);
+			for (; vma; vma = vma->vm_next) {
+				if (addr > limit)
+					break;
+				if (addr + len <= vma->vm_start)
+					goto success;
+				addr = vma->vm_end;
+			}
+		}
+	}
+
+	/* search from just above the WorkRAM area to the top of memory */
+	addr = PAGE_ALIGN(0x80000000);
+	limit = TASK_SIZE - len;
+	if (addr <= limit) {
+		vma = find_vma(current->mm, addr);
+		for (; vma; vma = vma->vm_next) {
+			if (addr > limit)
+				break;
+			if (addr + len <= vma->vm_start)
+				goto success;
+			addr = vma->vm_end;
+		}
+
+		if (!vma && addr <= limit)
+			goto success;
+	}
+
+#if 0
+	printk("[area] l=%lx (ENOMEM) f='%s'\n",
+	       len, filp ? filp->f_dentry->d_name.name : "");
+#endif
+	return -ENOMEM;
+
+ success:
+#if 0
+	printk("[area] l=%lx ad=%lx f='%s'\n",
+	       len, addr, filp ? filp->f_dentry->d_name.name : "");
+#endif
+	return addr;
+} /* end arch_get_unmapped_area() */
diff --git a/arch/frv/mm/extable.c b/arch/frv/mm/extable.c
new file mode 100644
index 00000000000..41be1128dc6
--- /dev/null
+++ b/arch/frv/mm/extable.c
@@ -0,0 +1,91 @@
+/*
+ * linux/arch/frv/mm/extable.c
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <asm/uaccess.h>
+
+extern const struct exception_table_entry __attribute__((aligned(8))) __start___ex_table[];
+extern const struct exception_table_entry __attribute__((aligned(8))) __stop___ex_table[];
+extern const void __memset_end, __memset_user_error_lr, __memset_user_error_handler;
+extern const void __memcpy_end, __memcpy_user_error_lr, __memcpy_user_error_handler;
+extern spinlock_t modlist_lock;
+
+/*****************************************************************************/
+/*
+ *
+ */
+static inline unsigned long search_one_table(const struct exception_table_entry *first,
+					     const struct exception_table_entry *last,
+					     unsigned long value)
+{
+        while (first <= last) {
+		const struct exception_table_entry __attribute__((aligned(8))) *mid;
+		long diff;
+
+		mid = (last - first) / 2 + first;
+		diff = mid->insn - value;
+                if (diff == 0)
+                        return mid->fixup;
+                else if (diff < 0)
+                        first = mid + 1;
+                else
+                        last = mid - 1;
+        }
+        return 0;
+} /* end search_one_table() */
+
+/*****************************************************************************/
+/*
+ * see if there's a fixup handler available to deal with a kernel fault
+ */
+unsigned long search_exception_table(unsigned long pc)
+{
+	unsigned long ret = 0;
+
+	/* determine if the fault lay during a memcpy_user or a memset_user */
+	if (__frame->lr == (unsigned long) &__memset_user_error_lr &&
+	    (unsigned long) &memset <= pc && pc < (unsigned long) &__memset_end
+	    ) {
+		/* the fault occurred in a protected memset
+		 * - we search for the return address (in LR) instead of the program counter
+		 * - it was probably during a clear_user()
+		 */
+		return (unsigned long) &__memset_user_error_handler;
+	}
+	else if (__frame->lr == (unsigned long) &__memcpy_user_error_lr &&
+		 (unsigned long) &memcpy <= pc && pc < (unsigned long) &__memcpy_end
+		 ) {
+		/* the fault occurred in a protected memset
+		 * - we search for the return address (in LR) instead of the program counter
+		 * - it was probably during a copy_to/from_user()
+		 */
+		return (unsigned long) &__memcpy_user_error_handler;
+	}
+
+#ifndef CONFIG_MODULES
+	/* there is only the kernel to search.  */
+	ret = search_one_table(__start___ex_table, __stop___ex_table - 1, pc);
+	return ret;
+
+#else
+	/* the kernel is the last "module" -- no need to treat it special */
+	unsigned long flags;
+	struct module *mp;
+
+	spin_lock_irqsave(&modlist_lock, flags);
+
+	for (mp = module_list; mp != NULL; mp = mp->next) {
+		if (mp->ex_table_start == NULL || !(mp->flags & (MOD_RUNNING | MOD_INITIALIZING)))
+			continue;
+		ret = search_one_table(mp->ex_table_start, mp->ex_table_end - 1, pc);
+		if (ret)
+			break;
+	}
+
+	spin_unlock_irqrestore(&modlist_lock, flags);
+	return ret;
+#endif
+} /* end search_exception_table() */
diff --git a/arch/frv/mm/fault.c b/arch/frv/mm/fault.c
new file mode 100644
index 00000000000..41d02ac4823
--- /dev/null
+++ b/arch/frv/mm/fault.c
@@ -0,0 +1,325 @@
+/*
+ *  linux/arch/frv/mm/fault.c
+ *
+ * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
+ * - Written by David Howells (dhowells@redhat.com)
+ * - Derived from arch/m68knommu/mm/fault.c
+ *   - Copyright (C) 1998  D. Jeff Dionne <jeff@lineo.ca>,
+ *   - Copyright (C) 2000  Lineo, Inc.  (www.lineo.com)
+ *
+ *  Based on:
+ *
+ *  linux/arch/m68k/mm/fault.c
+ *
+ *  Copyright (C) 1995  Hamish Macdonald
+ */
+
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/ptrace.h>
+#include <linux/hardirq.h>
+
+#include <asm/system.h>
+#include <asm/pgtable.h>
+#include <asm/uaccess.h>
+#include <asm/gdb-stub.h>
+
+/*****************************************************************************/
+/*
+ * This routine handles page faults.  It determines the problem, and
+ * then passes it off to one of the appropriate routines.
+ */
+asmlinkage void do_page_fault(int datammu, unsigned long esr0, unsigned long ear0)
+{
+	struct vm_area_struct *vma;
+	struct mm_struct *mm;
+	unsigned long _pme, lrai, lrad, fixup;
+	siginfo_t info;
+	pgd_t *pge;
+	pud_t *pue;
+	pte_t *pte;
+	int write;
+
+#if 0
+	const char *atxc[16] = {
+		[0x0] = "mmu-miss", [0x8] = "multi-dat", [0x9] = "multi-sat",
+		[0xa] = "tlb-miss", [0xc] = "privilege", [0xd] = "write-prot",
+	};
+
+	printk("do_page_fault(%d,%lx [%s],%lx)\n",
+	       datammu, esr0, atxc[esr0 >> 20 & 0xf], ear0);
+#endif
+
+	mm = current->mm;
+
+	/*
+	 * We fault-in kernel-space virtual memory on-demand. The
+	 * 'reference' page table is init_mm.pgd.
+	 *
+	 * NOTE! We MUST NOT take any locks for this case. We may
+	 * be in an interrupt or a critical region, and should
+	 * only copy the information from the master page table,
+	 * nothing more.
+	 *
+	 * This verifies that the fault happens in kernel space
+	 * and that the fault was a page not present (invalid) error
+	 */
+	if (!user_mode(__frame) && (esr0 & ESR0_ATXC) == ESR0_ATXC_AMRTLB_MISS) {
+		if (ear0 >= VMALLOC_START && ear0 < VMALLOC_END)
+			goto kernel_pte_fault;
+		if (ear0 >= PKMAP_BASE && ear0 < PKMAP_END)
+			goto kernel_pte_fault;
+	}
+
+	info.si_code = SEGV_MAPERR;
+
+	/*
+	 * If we're in an interrupt or have no user
+	 * context, we must not take the fault..
+	 */
+	if (in_interrupt() || !mm)
+		goto no_context;
+
+	down_read(&mm->mmap_sem);
+
+	vma = find_vma(mm, ear0);
+	if (!vma)
+		goto bad_area;
+	if (vma->vm_start <= ear0)
+		goto good_area;
+	if (!(vma->vm_flags & VM_GROWSDOWN))
+		goto bad_area;
+
+	if (user_mode(__frame)) {
+		/*
+		 * accessing the stack below %esp is always a bug.
+		 * The "+ 32" is there due to some instructions (like
+		 * pusha) doing post-decrement on the stack and that
+		 * doesn't show up until later..
+		 */
+		if ((ear0 & PAGE_MASK) + 2 * PAGE_SIZE < __frame->sp) {
+#if 0
+			printk("[%d] ### Access below stack @%lx (sp=%lx)\n",
+			       current->pid, ear0, __frame->sp);
+			show_registers(__frame);
+			printk("[%d] ### Code: [%08lx] %02x %02x %02x %02x %02x %02x %02x %02x\n",
+			       current->pid,
+			       __frame->pc,
+			       ((u8*)__frame->pc)[0],
+			       ((u8*)__frame->pc)[1],
+			       ((u8*)__frame->pc)[2],
+			       ((u8*)__frame->pc)[3],
+			       ((u8*)__frame->pc)[4],
+			       ((u8*)__frame->pc)[5],
+			       ((u8*)__frame->pc)[6],
+			       ((u8*)__frame->pc)[7]
+			       );
+#endif
+			goto bad_area;
+		}
+	}
+
+	if (expand_stack(vma, ear0))
+		goto bad_area;
+
+/*
+ * Ok, we have a good vm_area for this memory access, so
+ * we can handle it..
+ */
+ good_area:
+	info.si_code = SEGV_ACCERR;
+	write = 0;
+	switch (esr0 & ESR0_ATXC) {
+	default:
+		/* handle write to write protected page */
+	case ESR0_ATXC_WP_EXCEP:
+#ifdef TEST_VERIFY_AREA
+		if (!(user_mode(__frame)))
+			printk("WP fault at %08lx\n", __frame->pc);
+#endif
+		if (!(vma->vm_flags & VM_WRITE))
+			goto bad_area;
+		write = 1;
+		break;
+
+		 /* handle read from protected page */
+	case ESR0_ATXC_PRIV_EXCEP:
+		goto bad_area;
+
+		 /* handle read, write or exec on absent page
+		  * - can't support write without permitting read
+		  * - don't support execute without permitting read and vice-versa
+		  */
+	case ESR0_ATXC_AMRTLB_MISS:
+		if (!(vma->vm_flags & (VM_READ | VM_WRITE | VM_EXEC)))
+			goto bad_area;
+		break;
+	}
+
+	/*
+	 * If for any reason at all we couldn't handle the fault,
+	 * make sure we exit gracefully rather than endlessly redo
+	 * the fault.
+	 */
+	switch (handle_mm_fault(mm, vma, ear0, write)) {
+	case 1:
+		current->min_flt++;
+		break;
+	case 2:
+		current->maj_flt++;
+		break;
+	case 0:
+		goto do_sigbus;
+	default:
+		goto out_of_memory;
+	}
+
+	up_read(&mm->mmap_sem);
+	return;
+
+/*
+ * Something tried to access memory that isn't in our memory map..
+ * Fix it, but check if it's kernel or user first..
+ */
+ bad_area:
+	up_read(&mm->mmap_sem);
+
+	/* User mode accesses just cause a SIGSEGV */
+	if (user_mode(__frame)) {
+		info.si_signo = SIGSEGV;
+		info.si_errno = 0;
+		/* info.si_code has been set above */
+		info.si_addr = (void *) ear0;
+		force_sig_info(SIGSEGV, &info, current);
+		return;
+	}
+
+ no_context:
+	/* are we prepared to handle this kernel fault? */
+	if ((fixup = search_exception_table(__frame->pc)) != 0) {
+		__frame->pc = fixup;
+		return;
+	}
+
+/*
+ * Oops. The kernel tried to access some bad page. We'll have to
+ * terminate things with extreme prejudice.
+ */
+
+	bust_spinlocks(1);
+
+	if (ear0 < PAGE_SIZE)
+		printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
+	else
+		printk(KERN_ALERT "Unable to handle kernel paging request");
+	printk(" at virtual addr %08lx\n", ear0);
+	printk("  PC  : %08lx\n", __frame->pc);
+	printk("  EXC : esr0=%08lx ear0=%08lx\n", esr0, ear0);
+
+	asm("lrai %1,%0,#1,#0,#0" : "=&r"(lrai) : "r"(ear0));
+	asm("lrad %1,%0,#1,#0,#0" : "=&r"(lrad) : "r"(ear0));
+
+	printk(KERN_ALERT "  LRAI: %08lx\n", lrai);
+	printk(KERN_ALERT "  LRAD: %08lx\n", lrad);
+
+	__break_hijack_kernel_event();
+
+	pge = pgd_offset(current->mm, ear0);
+	pue = pud_offset(pge, ear0);
+	_pme = pue->pue[0].ste[0];
+
+	printk(KERN_ALERT "  PGE : %8p { PME %08lx }\n", pge, _pme);
+
+	if (_pme & xAMPRx_V) {
+		unsigned long dampr, damlr, val;
+
+		asm volatile("movsg dampr2,%0 ! movgs %2,dampr2 ! movsg damlr2,%1"
+			     : "=&r"(dampr), "=r"(damlr)
+			     : "r" (_pme | xAMPRx_L|xAMPRx_SS_16Kb|xAMPRx_S|xAMPRx_C|xAMPRx_V)
+			     );
+
+		pte = (pte_t *) damlr + __pte_index(ear0);
+		val = pte_val(*pte);
+
+		asm volatile("movgs %0,dampr2" :: "r" (dampr));
+
+		printk(KERN_ALERT "  PTE : %8p { %08lx }\n", pte, val);
+	}
+
+	die_if_kernel("Oops\n");
+	do_exit(SIGKILL);
+
+/*
+ * We ran out of memory, or some other thing happened to us that made
+ * us unable to handle the page fault gracefully.
+ */
+ out_of_memory:
+	up_read(&mm->mmap_sem);
+	printk("VM: killing process %s\n", current->comm);
+	if (user_mode(__frame))
+		do_exit(SIGKILL);
+	goto no_context;
+
+ do_sigbus:
+	up_read(&mm->mmap_sem);
+
+	/*
+	 * Send a sigbus, regardless of whether we were in kernel
+	 * or user mode.
+	 */
+	info.si_signo = SIGBUS;
+	info.si_errno = 0;
+	info.si_code = BUS_ADRERR;
+	info.si_addr = (void *) ear0;
+	force_sig_info(SIGBUS, &info, current);
+
+	/* Kernel mode? Handle exceptions or die */
+	if (!user_mode(__frame))
+		goto no_context;
+	return;
+
+/*
+ * The fault was caused by a kernel PTE (such as installed by vmalloc or kmap)
+ */
+ kernel_pte_fault:
+	{
+		/*
+		 * Synchronize this task's top level page-table
+		 * with the 'reference' page table.
+		 *
+		 * Do _not_ use "tsk" here. We might be inside
+		 * an interrupt in the middle of a task switch..
+		 */
+		int index = pgd_index(ear0);
+		pgd_t *pgd, *pgd_k;
+		pud_t *pud, *pud_k;
+		pmd_t *pmd, *pmd_k;
+		pte_t *pte_k;
+
+		pgd = (pgd_t *) __get_TTBR();
+		pgd = (pgd_t *)__va(pgd) + index;
+		pgd_k = ((pgd_t *)(init_mm.pgd)) + index;
+
+		if (!pgd_present(*pgd_k))
+			goto no_context;
+		//set_pgd(pgd, *pgd_k); /////// gcc ICE's on this line
+
+		pud_k = pud_offset(pgd_k, ear0);
+		if (!pud_present(*pud_k))
+			goto no_context;
+
+		pmd_k = pmd_offset(pud_k, ear0);
+		if (!pmd_present(*pmd_k))
+			goto no_context;
+
+		pud = pud_offset(pgd, ear0);
+		pmd = pmd_offset(pud, ear0);
+		set_pmd(pmd, *pmd_k);
+
+		pte_k = pte_offset_kernel(pmd_k, ear0);
+		if (!pte_present(*pte_k))
+			goto no_context;
+		return;
+	}
+} /* end do_page_fault() */
diff --git a/arch/frv/mm/highmem.c b/arch/frv/mm/highmem.c
new file mode 100644
index 00000000000..7dc8fbf3af9
--- /dev/null
+++ b/arch/frv/mm/highmem.c
@@ -0,0 +1,33 @@
+/* highmem.c: arch-specific highmem stuff
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/highmem.h>
+
+void *kmap(struct page *page)
+{
+	might_sleep();
+	if (!PageHighMem(page))
+		return page_address(page);
+	return kmap_high(page);
+}
+
+void kunmap(struct page *page)
+{
+	if (in_interrupt())
+		BUG();
+	if (!PageHighMem(page))
+		return;
+	kunmap_high(page);
+}
+
+struct page *kmap_atomic_to_page(void *ptr)
+{
+	return virt_to_page(ptr);
+}
diff --git a/arch/frv/mm/init.c b/arch/frv/mm/init.c
new file mode 100644
index 00000000000..41958f57c83
--- /dev/null
+++ b/arch/frv/mm/init.c
@@ -0,0 +1,241 @@
+/* init.c: memory initialisation for FRV
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Derived from:
+ *  - linux/arch/m68knommu/mm/init.c
+ *    - Copyright (C) 1998  D. Jeff Dionne <jeff@lineo.ca>, Kenneth Albanowski <kjahds@kjahds.com>,
+ *    - Copyright (C) 2000  Lineo, Inc.  (www.lineo.com)
+ *  - linux/arch/m68k/mm/init.c
+ *    - Copyright (C) 1995  Hamish Macdonald
+ */
+
+#include <linux/config.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/pagemap.h>
+#include <linux/swap.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/bootmem.h>
+#include <linux/highmem.h>
+
+#include <asm/setup.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/mmu_context.h>
+#include <asm/virtconvert.h>
+#include <asm/sections.h>
+#include <asm/tlb.h>
+
+#undef DEBUG
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+/*
+ * BAD_PAGE is the page that is used for page faults when linux
+ * is out-of-memory. Older versions of linux just did a
+ * do_exit(), but using this instead means there is less risk
+ * for a process dying in kernel mode, possibly leaving a inode
+ * unused etc..
+ *
+ * BAD_PAGETABLE is the accompanying page-table: it is initialized
+ * to point to BAD_PAGE entries.
+ *
+ * ZERO_PAGE is a special page that is used for zero-initialized
+ * data and COW.
+ */
+static unsigned long empty_bad_page_table;
+static unsigned long empty_bad_page;
+unsigned long empty_zero_page;
+
+/*****************************************************************************/
+/*
+ *
+ */
+void show_mem(void)
+{
+	unsigned long i;
+	int free = 0, total = 0, reserved = 0, shared = 0;
+
+	printk("\nMem-info:\n");
+	show_free_areas();
+	i = max_mapnr;
+	while (i-- > 0) {
+		struct page *page = &mem_map[i];
+
+		total++;
+		if (PageReserved(page))
+			reserved++;
+		else if (!page_count(page))
+			free++;
+		else
+			shared += page_count(page) - 1;
+	}
+
+	printk("%d pages of RAM\n",total);
+	printk("%d free pages\n",free);
+	printk("%d reserved pages\n",reserved);
+	printk("%d pages shared\n",shared);
+
+} /* end show_mem() */
+
+/*****************************************************************************/
+/*
+ * paging_init() continues the virtual memory environment setup which
+ * was begun by the code in arch/head.S.
+ * The parameters are pointers to where to stick the starting and ending
+ * addresses  of available kernel virtual memory.
+ */
+void __init paging_init(void)
+{
+	unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
+
+	/* allocate some pages for kernel housekeeping tasks */
+	empty_bad_page_table	= (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
+	empty_bad_page		= (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
+	empty_zero_page		= (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
+
+	memset((void *) empty_zero_page, 0, PAGE_SIZE);
+
+#if CONFIG_HIGHMEM
+	if (num_physpages - num_mappedpages) {
+		pgd_t *pge;
+		pud_t *pue;
+		pmd_t *pme;
+
+		pkmap_page_table = alloc_bootmem_pages(PAGE_SIZE);
+
+		memset(pkmap_page_table, 0, PAGE_SIZE);
+
+		pge = swapper_pg_dir + pgd_index_k(PKMAP_BASE);
+		pue = pud_offset(pge, PKMAP_BASE);
+		pme = pmd_offset(pue, PKMAP_BASE);
+		__set_pmd(pme, virt_to_phys(pkmap_page_table) | _PAGE_TABLE);
+	}
+#endif
+
+	/* distribute the allocatable pages across the various zones and pass them to the allocator
+	 */
+	zones_size[ZONE_DMA]     = max_low_pfn - min_low_pfn;
+	zones_size[ZONE_NORMAL]  = 0;
+#ifdef CONFIG_HIGHMEM
+	zones_size[ZONE_HIGHMEM] = num_physpages - num_mappedpages;
+#endif
+
+	free_area_init(zones_size);
+
+#ifdef CONFIG_MMU
+	/* initialise init's MMU context */
+	init_new_context(&init_task, &init_mm);
+#endif
+
+} /* end paging_init() */
+
+/*****************************************************************************/
+/*
+ *
+ */
+void __init mem_init(void)
+{
+	unsigned long npages = (memory_end - memory_start) >> PAGE_SHIFT;
+	unsigned long tmp;
+#ifdef CONFIG_MMU
+	unsigned long loop, pfn;
+	int datapages = 0;
+#endif
+	int codek = 0, datak = 0;
+
+	/* this will put all memory onto the freelists */
+	totalram_pages = free_all_bootmem();
+
+#ifdef CONFIG_MMU
+	for (loop = 0 ; loop < npages ; loop++)
+		if (PageReserved(&mem_map[loop]))
+			datapages++;
+
+#ifdef CONFIG_HIGHMEM
+	for (pfn = num_physpages - 1; pfn >= num_mappedpages; pfn--) {
+		struct page *page = &mem_map[pfn];
+
+		ClearPageReserved(page);
+		set_bit(PG_highmem, &page->fl